CN1253767C - Flow control circuit - Google Patents
Flow control circuit Download PDFInfo
- Publication number
- CN1253767C CN1253767C CNB2004100018374A CN200410001837A CN1253767C CN 1253767 C CN1253767 C CN 1253767C CN B2004100018374 A CNB2004100018374 A CN B2004100018374A CN 200410001837 A CN200410001837 A CN 200410001837A CN 1253767 C CN1253767 C CN 1253767C
- Authority
- CN
- China
- Prior art keywords
- delivery system
- fluid delivery
- flow
- described fluid
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0676—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on flow sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
- F15C1/00—Circuit elements having no moving parts
- F15C1/02—Details, e.g. special constructional devices for circuits with fluid elements, such as resistances, capacitive circuit elements; devices preventing reaction coupling in composite elements ; Switch boards; Programme devices
- F15C1/04—Means for controlling fluid streams to fluid devices, e.g. by electric signals or other signals, no mixing taking place between the signal and the flow to be controlled
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Theoretical Computer Science (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Flow Control (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A flow control scheme for use with a flow circuit, including a fluid transfer device such as a pump or a compressor. The flow control device monitors the power and pressure differential of the fluid transfer device. The flow control device is capable of maintaining the flow of the fluid transfer device at a baseline value in response to varying operational conditions within the flow circuit.
Description
Technical field
The present invention relates generally to the flow control field of fluid.Especially, the present invention relates to a method and apparatus, come Control Flow by a fluid flow circuit and in response to the variation in this fluid flow circuit.
Background technology
The fluid flow circuit generally includes a plurality of fluid treatment hardware, such as being linked together by a series of conduits with the heat exchanger that constitutes this circuit, valve, container, drum or the like.Under a lot of situations, the driving force that is used for driving described fluid flow circuit is provided by a fluid delivery system, such as a compressor or a pump.Fluid flow in the fluid delivery system depends on usually by described fluid delivery system and is added in pressure on the fluid.This pressure also can be regarded the pressure difference at described device two ends as.The increase of typical case's pressure difference causes the decline of the fluid flow of described device conveying.In most cases, this pressure difference increase is to be caused by the pressure drop increase in the described flow circuit, and described device just is included in this circuit.The increase of pressure drop can have multiple reason in the flow circuit, such as the reduction of fluid density in the described flow circuit, and the increase of a certain equipment two ends pressure drop in the described flow circuit, the increase of the operating pressure of a certain particular device in the perhaps described flow circuit.
If the pressure drop in the flow circuit is caused by the increase of a certain equipment two ends pressure drop in the flow circuit, so when this pressure drop increase be that situation just may bother especially when being caused by equipment failure.As time goes on equipment is easier usually breaks down rather than becomes more stable or cleaning more, and the pressure drop at such faulty equipment two ends then can increase along with use.In a sense, the pressure drop in the described circuit that is caused by equipment failure will be reduced to a unacceptable level to the working flow of the described fluid circuit of flowing through.Like this just must close described system and clean described equipment.Still be the viewpoint of revenue losses from work no matter, it all is arm and a leg closing and clean a fluid flow circuit.
To a solution of the failure problems in the fluid flow circuit is to monitor flow velocity in the described circuit with a flowmeter, and the speed that improves described fluid delivery system is to bring up to a normal or acceptable working level to flow velocity accordingly.One of problem that depends on the reading flow scale is that this flowmeter is insecure sometimes, in the time of particularly in being installed in the diphasic flow facility.In addition, these flowmeters itself sometimes also can fault, thereby has not only increased its unreliability, has also increased the pressure drop in the described fluid flow circuit.Therefore, just need the Apparatus and method for that in described fluid delivery system, to keep a sufficient constant flow rate, be used for using together with fluid delivery system and fluid flow circuit.In addition, keep in fluid delivery system in the substantially constant flow velocity, the work in also must can the fluid-responsive flow circuit of described equipment and method changes.
Summary of the invention
The present invention relates to a fluid flow circuit, comprise a fluid delivery system, a pressure difference measurement mechanism that is used for measuring described fluid delivery system two ends pressure difference, a power monitor device that is used for measuring described fluid delivery system power, and a controller that is connected in described pressure difference measurement mechanism and power monitor device.Described controller is kept a constant rate of flowing through wherein by the running speed of regulating described fluid delivery system in response to the variation pressure loss in the described fluid flow circuit.Described fluid delivery system can be a centrifugal pump, a positive displacement pump, a compressor, a turbine, a membrane pump, a hydroseal pump, perhaps other any can be to the device of a fluid flow circuit conveyance fluid.
Described controller is kept the power of described fluid delivery system as flow in the fluid delivery system and by the function of the measured pressure difference of described pressure difference measurement mechanism.Variation pressure drop in the described fluid flow circuit may be caused (downstream of described fluid delivery system) by the pressure increase in the High Voltage part of described fluid flow circuit.Variation pressure drop in the wherein said fluid flow circuit comprises the increase of pressure loss in the described fluid flow circuit.
An embodiment of fluid flow circuit of the present invention can comprise a pump with an inlet port and an escape hole, wherein, is equipped with first pressure measurer and a power monitor device that is used for measuring pump power entering the mouth.Also comprise a speed control unit that is used for measuring revolution speed and can changes this rotating speed in another embodiment, place second pressure measurer of described escape hole, and a controller that is connected in controller, the second pressure control device, power monitor device and the speed control unit of the first pressure control device.This controller and described speed control unit cooperation are by regulating the constant rate that revolution speed is kept this pump of flowing through in response to the variation working condition in the described fluid flow circuit.
The present invention includes a method of in a fluid flow circuit, keeping a constant rate, the method may further comprise the steps, a fluid delivery system is installed in a fluid flow circuit, for described fluid delivery system is created a baseline flow, monitor the pressure difference at described fluid delivery system two ends, monitoring offers the power of described fluid delivery system, and adjusting offers the power of described fluid delivery system to keep one and described baseline flow flow about equally in described fluid delivery system.Described fluid delivery system can be a centrifugal pump, a positive displacement pump, a compressor, a turbine, a membrane pump, or a hydroseal pump.A method of the present invention comprises to be determined the power of described fluid delivery system as flow in the fluid delivery system and by the function of the measured pressure difference of described pressure difference measurement mechanism.
The power that wherein offers described fluid delivery system is regulated by increasing its amplitude.
The power that wherein offers described fluid delivery system is regulated by reducing its amplitude.
Wherein regulate and offer the power of described fluid delivery system to produce a flow that is higher than the described fluid delivery system of flowing through of described baseline flow.
Wherein regulate and offer the power of described fluid delivery system to produce a flow that is lower than the described fluid delivery system of flowing through of described baseline flow.
Description of drawings
Fig. 1 is the synoptic diagram of a flow circuit.
Fig. 2 has described the flow curve of a fluid delivery system.
Embodiment
The accompanying drawing with reference to has here illustrated a flow circuit 10 among Fig. 1, comprise 20, one fluid delivery systems 30 of 11, one containers of pipeline and a fluid treating device 40.This fluid treating device 40 is illustrated as a heat exchanger, the flow through pipeline of device 40 of the pending fluid of described flow circuit 10.Yet many other processing element can constitute this fluid treating device 40, such as a filtrator, exsiccator, separator(-ter), perhaps coalescent filter.Similarly, these replace element, or other or the like element also can substitute described container 20.
Particular element as the flow circuit 10 described in Fig. 1 is unimportant to the present invention, just illustrates for explanation.The present invention will operate with specific features shown in Fig. 1 or still less or other fluid treatment hardware, such as other container, interchanger or the like.Similarly, described fluid delivery system is shown as a centrifugal pump and comes drive fluid to flow through a treatment circuit, but it also can be a compressor, ebullator, turbine, membrane pump, perhaps any other device.
In a specific implementations of the present invention as described in Figure 1, the fluid 21 in the container 21 flows to a fluid delivery system 30, and wherein energy is passed to fluid 21 with the situation of additional pressure.Fluid 21 is with pressure effluent fluid conveying device 30 and a fluid treating device 40 of flowing through before returning container 20 that has increased.A series of pipelines 11 connect each equipment and conducting fluid 21.Fluid 21 can be a liquid, gas, steam, mud, powder, any material of a fluid treating device 40 and composition thereof of flowing through that is driven.
A pressure difference measurement mechanism is connected to the upstream 29 and the downstream 31 of the pipeline 11 of fluid delivery system 30, and the fluid pressure that is used for measuring fluid delivery system 30 two ends is poor.The typical case, the upstream pressure 29 of fluid delivery system 30 will be lower than its downstream pressure 31.Can see that the person skilled in the art can determine and use suitable hardware and monitoring standard to obtain a suitable mode of obtaining this pressure difference at an easy rate.
Power monitor device 52 is measured the power that is consumed by fluid delivery system 30.The typical case, fluid delivery system 30 is by driven by power, and power monitor device 52 is just measured the voltage and current of delivering to fluid delivery system 30 like this.The voltage and current data of being measured by power monitor device 52 are sent to controller 54.The power that is consumed by fluid delivery system 30 can calculate in power monitor device 52, controller 54 or other device.Like this, the method and the technology that are used for calculating the electric power that is consumed by fluid delivery system 30 for purposes of the invention are just inessential, and any known now or being used for of developing later on obtains the method for the power of fluid delivery system 30 and all be taken into account within the scope of the present invention.
The flow velocity of fluid delivery system 30 is directly relevant with the product of its efficient and a ratio, and this ratio is its power consumption and the ratio of pressure difference.Be used for determining that the general equation of its flow is: flow velocity=(power consumption/pressure difference) * efficient.In a more specific relation, can determine by following equation: flow velocity (gpm)=(electric horsepower of input motor) (electric efficiency) (3960) (pump efficiency) (the high foot of head) (proportion) by the flow velocity of a centrifugal pump.Utilize these relational expressions, the present invention just can be according to the power consumption of fluid delivery system 30 and pressure difference determine to flow through wherein flow.The efficient of employed fluid delivery system depends on its structure and model fully, and like this, information needed should obtain from the manufacturer of this device.Should be noted that the present invention is not only applicable to a collection of fluid delivery system, also be applicable to this type of device of multiple structure and model.Shown in each discharge relation formula the prefered method of determining flow according to the power and the pressure difference of fluid delivery system 30 has been described.Yet, each equation that scope of the present invention is not limited to mention here, but comprised all relational expressions known or that development is later on come out.
Referring now to Fig. 2, the head (head) and the flow characteristics of a fluid delivery system described by family of curves (66-68).As everyone knows, every curve (66-68) all is relevant to a constant operating rate of described fluid delivery system.For the purpose of describing, suppose the corresponding baseline volume flow of sidenote numeral 69 representatives under corresponding baseline head 70.Baseline volume flow 69 and baseline head 70 have been represented the expectation or the design conditions of described fluid delivery system.In addition, if described fluid delivery system is operated in curve 66, then the baseline flow just will be realized at the numeral of the sidenote on the curve 66 61 places.If the back pressure of described fluid delivery system increases (supposing that inlet pressure and rotational speed are constant), then because the pressure difference (or head) at described fluid delivery system two ends raises, will rise along curve in the working point of described fluid delivery system.As can be seen from Figure 2, when the working point of described fluid delivery system when curve rises to sidenote numeral 62 places, the flow of described fluid delivery system descends.Yet if the speed of described fluid delivery system is enhanced to work along curve 67, baseline flow 69 can obtain when head meets or exceeds baseline head 70.
The back pressure of fluid delivery system 30 may rise because of multiple reason.Such as the solid suspension in the fluid 21 may precipitate (fault promptly) thereby the pressure drop at fluid treating device 40 two ends that raise in fluid treating device 40.The pressure drop that fluid treating device 40 two ends raise can be converted into the rising at fluid delivery system 30 exit pressure, thus the pressure difference at fluid delivery system 30 two ends that correspondingly raise.If fluid treating device 40 is heat exchangers, then its fault is almost unavoidable.
It is how about a specific flow circuit job that system's curve 80 and 82 has been represented fluid delivery system 30.But curve supposition system of described system (or circuit) is stable and a constant pressure loss is provided can for the fluid flow of roughly the same measuring together.Like this, be changed or changed its running parameter if made up the described system (or circuit) of fluid delivery system 30, then described system curve is no longer represented the running parameter (head and flow) of fluid delivery system 30.Pressure drop that the reformed example of system is particular device two ends in the described system raises, for example, a fault heat exchanger, fault flow element or one more or less pressure drop controls valve is provided.
Controller 54 can be multiple structure or model, but it should provide automatic control constant relatively always with the flow of the flow circuit 10 of guaranteeing to flow through for flow circuit 10.Like this, controller 54 preferably is made of an electronic processing system, such as a programmable computing machine or microsystem, perhaps by the software control that is stored in other places, and can to offer it data frequently sample, such as per minute is repeatedly sampled.Controller 54 also should be able to the received data of fast processing, like this it just can the estimated data so that send one instant or be close to instant instruction and regulate the running parameter of flow circuit 10.One of advantage of introducing an electronic programmable system is the dirigibility that it can estimate the treatment progress that numbers of poles is inequality according to the instruction of enrolling or import controller 54 into.
In the course of work, controller 54 comes continuous monitoring flow through wherein flow by estimation power consumption of fluid delivery system 30 and two ends pressure difference thereof.If described flow reduces, then the energy of passing to fluid by fluid delivery system 30 reduces equally.Be lower than the set point that enrolls controller 54 when flow drops to, then these set points just are triggered.And in a single day trigger, the controller 54 among the present invention will improve (or reduction) thereby the flow and the head of the feasible fluid delivery system 30 of flowing through of the speed of fluid delivery system 30 raise (or reduction).
With reference to Fig. 2, in a more specific example, imagination fluid delivery system 30 is operated in sidenote numeral 61 places on the curve 66, and then fluid delivery system 30 will provide a flow 69 at head 70 places.Like this, fluid delivery system 30 just is operated on system's curve 80.When the pressure of the outlet conduit of fluid delivery system 30 increased, its discharge characteristic will rise to sidenote numeral 62 places along curve, and the result obtains a new flow 71 and head 72.Like this, described system just can not be represented by system's curve 80, but by 82 representatives of system's curve.Sidenote numeral 62 places that are set in of enrolling described controller for hypothesis for example are triggered, and the speed that described then controller just can improve fluid delivery system 30 to be being operated in digital 63 places of sidenote on the curve 67, and still obtain baseline flow 69.In addition, can set up set point makes fluid delivery system 30 that its flow (together with corresponding head) is brought up to the level that has more some number percents than the baseline flow of sidenote numeral 69.
On the contrary, if the pressure loss in the flow circuit 10 reduces, then controller 54 can be programmed the speed that reduces described fluid delivery system and keep the desired baseline flow of described particular procedure process.Like this, controller 54 just can be programmed and guarantee that fluid flow circuit 10 has a constant relatively flow and response work wherein to change.These variations comprise the variation of described circuit two ends pressure drop, on the whole or because variable density, change in flow or because the change in pressure drop of particular device.
The standard that is used for determining the set point of controller 54 depends on flow circuit 10 and job specification thereof, designing requirement and/or system accuracy.Some treatment circuits can be in the change in flow scope of a broad operational excellence, other then must keep a narrower flow rates for operate as normal.Therefore the size of flow and all almost completely depend in the size of flow velocity 71 and 69 percentage changes and to adopt practical application of the present invention.Can see that the test that the person skilled in the art must be inexcessive just can propose suitable set point to use this invention.
The flow of controlling fluid delivery system 30 in the above described manner has many good qualities.For instance, when the pressure loss in the flow circuit 10 is because during as the equipment failure of heat exchanger and so on, dynamic system described here just can need not frequently remove, clean described faulty equipment and close under the situation of entire circuit and make response to keep desired baseline flow.This is especially valuable in chemical purifying system, wherein has polymerizable material, such as (methyl) propionic acid alkene or styrene.For instance, the cleaning cycle of a heat exchanger (such as a reboiler) can be from 3-4 month to 1 year or more time, and since its fault of rising of pressure drop the flow in the flow circuit 10 can be reduced to below the baseline flow.So, just can in maintenance, fund and other expenses, realize a considerable saving at an easy rate by using the present invention.And because other flow control methods requires to exist in the equipment by-pass valve control or the flowmeter that causes the fluid friction loss usually, then energy loss equally also can significantly reduce.Eliminate these frictional dissipation meetings and reduce the work capacity that consumes by fluid delivery system 30.
Another advantage of the present invention is to regulate the dirigibility of baseline flow.The utilization of controller 54 makes an operator can upgrade described baseline flow value when fluid circuit 10 is online.In addition, when fluid circuit 10 was online, described set point also can be changed.
Therefore, the present invention described herein is suitable for realizing, obtaining noted earlier and wherein intrinsic purpose, result and advantage very much.Be used for openly, the present invention has provided a current first-selected embodiment, and concerning the program that is used to obtain desired result, its details can be done a large amount of changes.The person skilled in the art can expect easily that these and other similar change, described change are prescribed within the scope that is included in the spirit of the present invention that is disclosed in this and appended claims.
Claims (12)
1. fluid flow circuit comprises:
A fluid delivery system;
A pressure difference measurement mechanism is used for measuring the pressure difference on the described fluid delivery system;
A power monitor device is used for measuring the power of described fluid delivery system; And
A controller is connected in described pressure difference measurement mechanism and described power monitor device,
Wherein said controller is programmed with software instruction, reflect the data of the power and the pressure difference of described fluid delivery system with automatic sampling, and the constant flow of keeping the described fluid delivery system of flowing through automatically according to the power and the pressure difference of described fluid delivery system.
2. the fluid flow circuit of claim 1, the speed of wherein said controller by regulating described fluid delivery system in response to the variation of system's curve of described fluid delivery system is to keep the constant flow of the described fluid delivery system of flowing through.
3. the fluid flow circuit of claim 1, wherein said fluid delivery system is selected from following one group of device, a centrifugal pump, a positive displacement pump, a compressor, a turbine, a membrane pump and a hydroseal pump.
4. the fluid flow circuit of claim 1, the variation pressure drop in the wherein said fluid flow circuit comprises the increase of pressure loss in the described fluid flow circuit.
5. the fluid flow circuit of claim 1, wherein said constant rate equals the baseline flow of described fluid flow circuit.
6. a method is used for keeping a constant flow in a fluid flow circuit, may further comprise the steps:
A fluid delivery system is installed in a fluid flow circuit;
For described fluid delivery system is set up a baseline flow;
Monitor the pressure difference on the described fluid delivery system;
Monitoring offers the power of described fluid delivery system; And
Adjusting offers the power of described fluid delivery system to keep one and the equal flow of described baseline flow in described fluid delivery system.
7. the method for claim 6, wherein in described installation steps, described fluid delivery system is selected from following one group of device, a centrifugal pump, a positive displacement pump, a compressor, a turbine, a membrane pump and a hydroseal pump.
8. the method for claim 6 also comprises the power of described fluid delivery system is determined as the flow of the described fluid delivery system of flowing through with by the function of a measured pressure difference of pressure difference measurement mechanism.
9. the method for claim 6, the power that wherein offers described fluid delivery system is regulated by increasing its amplitude.
10. the method for claim 6, the power that wherein offers described fluid delivery system is regulated by reducing its amplitude.
11. the method for claim 6 is wherein regulated and is offered the power of described fluid delivery system to produce a flow that is higher than the described fluid delivery system of flowing through of described baseline flow.
12. the method for claim 6 is wherein regulated and is offered the power of described fluid delivery system to produce a flow that is lower than the described fluid delivery system of flowing through of described baseline flow.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US44202703P | 2003-01-23 | 2003-01-23 | |
| US60/442,027 | 2003-01-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1517820A CN1517820A (en) | 2004-08-04 |
| CN1253767C true CN1253767C (en) | 2006-04-26 |
Family
ID=32595370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100018374A Expired - Fee Related CN1253767C (en) | 2003-01-23 | 2004-01-14 | Flow control circuit |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1441272A3 (en) |
| JP (1) | JP2004225699A (en) |
| KR (1) | KR20040067973A (en) |
| CN (1) | CN1253767C (en) |
| AU (1) | AU2004200102A1 (en) |
| BR (1) | BRPI0400024A (en) |
| TW (1) | TWI247202B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR112015031778A2 (en) | 2013-06-28 | 2017-07-25 | Provtagaren Ab | method for checking the correct function of sampling equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1798080C2 (en) * | 1968-08-19 | 1974-05-16 | Pierburg Luftfahrtgeraete Union Gmbh, 4040 Neuss | Electronically controlled flow meter and metering device |
| AT394909B (en) * | 1990-06-01 | 1992-07-27 | Vaillant Gmbh | DEVICE FOR CONTINUOUSLY MONITORING A VARIABLE AIRFLOW |
| US5447414A (en) * | 1994-05-27 | 1995-09-05 | Emerson Electric Co. | Constant air flow control apparatus and method |
| IT1298781B1 (en) * | 1998-03-24 | 2000-02-02 | Rpm S P A | VENTILATION SYSTEM WITH CONTROL UNIT |
| US6468042B2 (en) * | 1999-07-12 | 2002-10-22 | Danfoss Drives A/S | Method for regulating a delivery variable of a pump |
-
2004
- 2004-01-09 EP EP04250078A patent/EP1441272A3/en not_active Withdrawn
- 2004-01-09 TW TW093100558A patent/TWI247202B/en not_active IP Right Cessation
- 2004-01-12 AU AU2004200102A patent/AU2004200102A1/en not_active Abandoned
- 2004-01-14 CN CNB2004100018374A patent/CN1253767C/en not_active Expired - Fee Related
- 2004-01-15 BR BR0400024-2A patent/BRPI0400024A/en not_active IP Right Cessation
- 2004-01-19 KR KR1020040003969A patent/KR20040067973A/en not_active Application Discontinuation
- 2004-01-22 JP JP2004014084A patent/JP2004225699A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004225699A (en) | 2004-08-12 |
| EP1441272A2 (en) | 2004-07-28 |
| EP1441272A3 (en) | 2005-05-04 |
| EP1441272A8 (en) | 2005-07-06 |
| TW200426553A (en) | 2004-12-01 |
| AU2004200102A1 (en) | 2004-08-12 |
| BRPI0400024A (en) | 2004-12-28 |
| KR20040067973A (en) | 2004-07-30 |
| TWI247202B (en) | 2006-01-11 |
| CN1517820A (en) | 2004-08-04 |
| EP1441272A9 (en) | 2005-09-07 |
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